86 MEMOIRS ON THE COLEOPTERA 



broader but of similar oblong-oval parallel obtuse form and convex 

 surface, perfectly smooth throughout and with scarcely a trace of 

 sculpture, except the two lateral ridges, which are often as pro- 

 nounced and conspicuous as in duplicates, the inner sometimes less 

 elevated; hind tarsi (cf ) notably thick, rather longer than the tibiae, 

 which have numerous stiff pallid hairs internally and especially 

 toward tip, or ( 9 ) much more slender though but little shorter and 

 barely as long as the tibiae. Length 26.0-27.5 mm.; width 10.2- 



10.3 mm. Texas costifer Lee. 



19 Body very stout, convex, large in size, deep black, rather shining, 

 very seldom with evident colored margins; hind tibiae (cf ) with a 



more or less dense brush of hairs internally at apex 20 



Body much narrower, smaller in size, the hind tibiae (cf ) never much 



more conspicuously pubescent within 23 



20 General outline somewhat as in depresses, the elytra normally elon- 

 gate, the antennae rather long as usual 21 



General outline much more abbreviated, the elytra unusually short for 

 this section of the genus, between a third and fourth longer than 

 wide; antennae short, the outer joints but little longer than wide. .22 

 21 Elytra oblong-oval, the sides less rounded; head very large, the 

 labrum trilobed, the median lobe slightly the widest; mandibles 

 (cf) only partially strigose, the apical part slender, moderately 

 prolonged; impressions deep and long; prothorax fully one-half wider 

 than long, widest near apical third, the rounded sides moderately 

 converging posteriorly, becoming broadly sinuate basally and straight 

 for a moderate distance before the right and sharp angles; base 

 evidently but not greatly narrower than the apex, the marginal groove 

 rather narrow, not attaining the base, the basal groove strong, sub- 

 entire, the impressions rather strong, partially uniting with a smaller 

 impression near the basal angles; elytra two-fifths longer than wide, 

 the margin rather narrower than in impressus, black; surface even 

 and with geminate series of rather strong, very distinct, impressed 

 punctures; hind tarsi (cf ) rather stout, distinctly shorter than the 

 tibiae, which have the coarse hairs of the internal apical brush dense 

 and fulvous. Length 32.5 mm.; width 13.0 mm. Texas. 



californicus Chaud. 



A Similar but rather more shining, the strigation of the mandibles finer 

 and less close; margins black; prothorax a little more transverse, 

 three-fifths wider than long, otherwise similar, except that the 

 subbasal impressions are very feeble; elytra similar in form but 

 wholly impunctate; hind tarsi (cf ) longer, fully as long as the 

 tibiae, the internal brush of which is black or blackish in color and 

 not fulvous. Length 30.5 mm.; width 12.5 mm. Texas (El 



Paso), Dunn transversus n. subsp. 



B Rather narrower and more parallel than either of the preceding, 

 the mandibles (cf) closely strigose, becoming smooth apically, 

 probably wholly strigose in the female; prothorax less transverse, 

 barely one-half wider than long, of the same general form and with 

 the impressions nearly as strong as in californicus; elytra less 

 rounded at the sides and with still narrower margin, impunctate, 



